AN1910 Freescale Semiconductor / Motorola, AN1910 Datasheet - Page 11

• Manufacturer Part Number: AN1910
• Description: 3-Phase AC Motor Control with V/Hz Speed Closed Loop Using the DSP56F80X
• Manufacturer: Freescale Semiconductor / Motorola

6.
6.1 Data Flow
This section describes the design of the software blocks of the drive. The software will be described in
terms of data flow and state diagrams.
The requirements of the drive dictates the software gather some values from the user interface and
sensors, process them and generate 3-phase PWM signals for inverter.
The control algorithm of close loop AC drive is described in
contains the processes described in the following subsections. The detailed description is given to the
subroutines 3-phase PWM calculation and volt per hertz control algorithm.
(OverVoltage/OverCurrent)
Temperature
Temperature
Software Design
(A/D)
PWM Faults
Fault Control
Drive Fault Status
DC-Bus Voltage
3-Phase AC Motor Control with V/Hz Speech Closed Loop
u_dc_bus
(A/D)
Freescale Semiconductor, Inc.
For More Information On This Product,
Acceleration/Deceleration Ramp
PVAL0
Go to: www.freescale.com
Figure 6-1. Data Flow
DC-Bus Voltage Ripple Elimination
MASTER
Omega_desired
PC
Omega_required
AmplitudeVoltScale
Amplitude
PI Controller
SETTING
SPEED
PWM Generation
V/Hz Ramp
PVAL2
Omega_command
Figure
Speed Measurement
6-1. The control algorithm
INCREMENTAL
Omega_actual
ENCODER
PVAL4
Software Design
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